Fuel Pump Throttle Conical Inlet Flow Separation
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Solution Overview
Problem
Existing fuel pump arrangements face challenges in achieving a compact design while maintaining favorable flow conditions, particularly in suction-throttled operations, where flow separation and variable throttling effects occur due to the configuration of the inlet and connecting channels.
Innovation Solution
The fuel pump incorporates a throttle with a specific design, where the throttle is aligned with the axis of the inlet channel and connected to a conical end section, preventing flow separation and ensuring a consistent throttling effect by maintaining a uniform effective length, which is achieved through a stepped tool configuration and integration within the housing parts of the low-pressure and high-pressure pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the throttle is arranged in the extension of the inlet channel with a compact configuration, then the device complexity is reduced and manufacturing is simplified, but flow separation may occur and throttling effectiveness may be compromised
Solution Approach 1:
The patent applies local quality by creating a conical end section at the inlet channel with a specific geometry (opening angle α between 30°-60°) that is different from the cylindrical section. This localized geometric modification ensures favorable flow conditions at the critical transition zone where the throttle is positioned, preventing flow separation while maintaining the overall compact design. The conical section's specific dimensions and angle are optimized to ensure smooth flow transition into the throttle opening.
2Productivity
If the throttle diameter is reduced to achieve better flow control, then the throttling effect is improved, but flow separation occurs and the effective throttle area is reduced
Solution Approach 1:
The patent applies spheroidality by replacing the sharp corner transition between the inlet channel and throttle opening with a conical surface. This curved transition surface (with opening angle α between 30°-60°) eliminates flow separation that would occur with sharp edges, ensuring that the full throttle diameter is effective even when the throttle is positioned in the channel extension. The curved geometry guides flow smoothly into the throttle opening, maintaining stable operation.
3Volume of moving object
If the inlet channel and connecting channel are arranged at different directions to achieve compact design, then the pump arrangement is more compact, but unfavorable flow conditions occur including flow separation
Solution Approach 1:
The patent applies spheroidality by introducing a conical end section at the inlet channel that provides a smooth, curved transition for the flow. This conical geometry (with opening angle α between 30°-60°) eliminates flow separation that would occur at sharp corners when channels are arranged at different directions. The curved transition surface guides flow smoothly from the inlet channel into the connecting channel, maintaining favorable flow conditions even in the compact angular arrangement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the operational efficiency of the fuel pump by ensuring a defined throttling effect, preventing flow separation, and achieving a compact design that maintains a consistent throttling performance, suitable for various applications including diesel fuel injection systems.
Implementation Method 1
preventing flow separation and ensuring a consistent throttling effect
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a fuel pump (1) serving in particular as a vacuum pump for a pump arrangement having a vacuum pump and a high-pressure pump for fuel injection systems of turbocharged compression-ignition internal combustion engines, comprising an inlet channel (15) and a connecting channel (19) on the suction side thereof. The connecting channel (19) thereby runs in a direction (22) deviating from a direction (16) of the inlet channel (15). A throttle (30) is further provided, wherein the throttle (30) connects to the inlet channel (15) in the direction (16) of the inlet channel (15) and opens into the connecting channel (19) on the side. A reliable throttle effect is thus provided, in order to allow vacuum-throttled operation of the fuel pump.